broken patch in Zsh Mailing List Archive

["Jun. T" <takimoto-j@xxxxxxxxxxxxxxxxx>]

I've noticed that the patch in

https://www.zsh.org/mla/workers/2024/msg00461.html
workers/52899: [PATCH 1/1] zsh/random

is duplicated, and moreover, the 1st half is corrupted.
For example, a line starting with
  +For example, if $#a is 16, you would ...
is combined with the following line. There are a few more
shuch lines.

I guess the 1st half is from the mail text and the 2nd
half is from the attached file. I have no idea why the
1st half has been corrupted.

So what is the recommended way to send a patch?
Include in the mail text (and do not attach a file), or,
if it is not possible, attach a file?